docs: def filter_data(self, data, value=None, args=None):
          """Morph log data by preceeding time period (single log)"""
          if args:
              if not args.last:
                  return data
          if not value: value = args.last
          # Set the units and number from the option:
          lastunit = value[-1]
          lastnum = value[:-1]
          
          # Set the start time:
          if lastunit == 's':
              starttime = datetime.utcnow() - \
                      timedelta(seconds=int(lastnum))
          if lastunit == 'm':
              starttime = datetime.utcnow() - \
                      timedelta(minutes=int(lastnum))
          if lastunit == 'h':
              starttime = datetime.utcnow() - \
                      timedelta(hours=int(lastnum))
          if lastunit == 'd':
              starttime = datetime.utcnow() - \
                      timedelta(days=int(lastnum))
          ourstart = int(starttime.strftime('%Y%m%d%H%M%S'))
          
          # Pull out the specified time period:
          newdata = {}
          if 'parser' in data.keys():
              newdata['parser'] = data['parser']
              newdata['source_path'] = data['source_path']
              newdata['source_file'] = data['source_file']
              newdata['source_file_mtime'] = data['source_file_mtime']
              newdata['source_file_year'] = data['source_file_year']
          newdata['entries'] = []
  
          for entry in data['entries']:
              if 'numeric_date_stamp_utc' in entry.keys():
                  if '.' in entry['numeric_date_stamp_utc']:
                      dstamp = int(entry['numeric_date_stamp_utc'].split('.')[0])
                  else:
                      dstamp = int(entry['numeric_date_stamp_utc'])
                  if dstamp >= ourstart: 
                      newdata['entries'].append(entry)
  
          return newdata